An atom is the basic building block of matter. an atom is made up of three smaller parts: the proton, neutron, and electron. which item is the largest?

i believe it is a.) released into

explanation:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: